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Journal Articles

Slow magnetic relaxation of linear trinuclear M(II)-Gd(III)-M(II) complexes with $$D_{3}$$ point group symmetry (M(II) = Zn(II) and Mg(II))

Masuda, Yuka*; Sakata, Shiomi*; Kayahara, Saori*; Irie, Natsumi*; Kofu, Maiko; Kono, Yohei*; Sakakibara, Toshiro*; Horii, Yoji*; Kajiwara, Takashi*

Journal of Physical Chemistry C, 127(6), p.3295 - 3306, 2023/02

Journal Articles

Development of ITER CODAC compatible gyrotron local control system and its operation

Oda, Yasuhisa; Oshima, Katsumi; Nakamoto, Takashi*; Hashimoto, Yasunori*; Yamamoto, Tsuyoshi; Hayashi, Kazuo*; Ikeda, Yukiharu; Ikeda, Ryosuke; Kajiwara, Ken; Takahashi, Koji; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 90(7), p.365 - 373, 2014/07

no abstracts in English

Journal Articles

Longitudinal spin Seebeck effect in various garnet ferrites

Uchida, Kenichi*; Nonaka, Tatsumi*; Kikkawa, Takashi*; Kajiwara, Yosuke*; Saito, Eiji

Physical Review B, 87(10), p.104412_1 - 104412_6, 2013/03

 Times Cited Count:97 Percentile:94.71(Materials Science, Multidisciplinary)

The longitudinal spin Seebeck effect (LSSE) is investigated in various garnet ferritesY$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$ ($$R$$ = Gd, Ca; $$M$$ = Al, Mn, V, In, Zr) by means of the inverse spin Hall effect in Pt films. The magnitude of the LSSE voltage in the Pt/Y$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$ samples is found to be enhanced with increasing concentration of Fe in the garnet ferrites, which can be explained by a change in the spin-mixing conductance at the Pt/Y$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$ interfaces. We also investigate the dependence of the LSSE voltage on macroscopic magnetic parameters of Y$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$. The experimental results show that the LSSE voltage in the Pt/Y$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$ samples hasa positive correlation with the Curie temperature and the saturation magnetization, but no clear correlation with the gyromagnetic ratio and the Gilbert damping constant of the samples.

Journal Articles

Spin-current-driven thermoelectric coating

Kirihara, Akihiro*; Uchida, Kenichi*; Kajiwara, Yosuke*; Ishida, Masahiko*; Nakamura, Yasunobu*; Manako, Takashi*; Saito, Eiji; Yorozu, Shinichi*

Nature Materials, 11(8), p.686 - 689, 2012/08

 Times Cited Count:236 Percentile:98.6(Chemistry, Physical)

Journal Articles

Recent research activities on breakdown and start-up towards future superconducting large tokamaks

Maekawa, Takashi*; Ide, Shunsuke; Kajiwara, Ken; Nagasaki, Kazunobu*; Isayama, Akihiko; Hada, Kazuyoshi*

Purazuma, Kaku Yugo Gakkai-Shi, 87(10), p.671 - 681, 2011/10

no abstracts in English

Journal Articles

Developments of high power gyrotron and power modulation technique using the JT-60U ECRF system

Kobayashi, Takayuki; Terakado, Masayuki; Sato, Fumiaki; Yokokura, Kenji; Shimono, Mitsugu; Hasegawa, Koichi; Sawahata, Masayuki; Suzuki, Sadaaki; Hiranai, Shinichi; Igarashi, Koichi; et al.

Plasma and Fusion Research (Internet), 4, p.037_1 - 037_10, 2009/08

Electron cyclotron (EC) heating and current drive (CD) are key tools to control fusion plasma especially for effective electron heating and for suppression of neoclassical tearing mode (NTM). Recently, developments of a high power gyrotron and a power modulation technique have been successfully achieved on JT-60U ECRF system in order to enhance the system performance. Stable gyrotron oscillation with oscillation power of 1.5 MW for 1 s was demonstrated in 2007, for the first time. Then temperature rise of cavity and collector has been investigated. It has been shown that the longer pulse operation with 1.5 MW by an improved 110 GHz gyrotron is possible. In addition, modulated ECCD in synchronized with NTM rotation has been performed with the oscillation power of 0.8 MW and the frequency around 5 kHz. The synchronizing system has worked very well and it has played an essential role in NTM suppression experiments on JT-60U.

Journal Articles

Development and achievements on the high power ECRF system in JT-60U

Moriyama, Shinichi; Kobayashi, Takayuki; Isayama, Akihiko; Terakado, Masayuki; Sawahata, Masayuki; Suzuki, Sadaaki; Yokokura, Kenji; Shimono, Mitsugu; Hasegawa, Koichi; Hiranai, Shinichi; et al.

Nuclear Fusion, 49(8), p.085001_1 - 085001_7, 2009/07

 Times Cited Count:20 Percentile:61.88(Physics, Fluids & Plasmas)

In the gyrotron development in JT-60U ECRF system, output power of 1.5 MW for 1 s has been achieved at 110 GHz. It is the world highest power oscillation $$>$$ 1 s. In addition to the carefully designed cavity and collector in view of thermal stress, an RF shield for the adjustment bellows, and a low-dielectric-loss DC break enabled this achievement. Power modulation technique by anode voltage control was improved to obtain high modulation frequency and 5 kHz has been achieved for NTM stabilizing experiments. Long pulse demonstration of 0.4 MW, 30 s injection to the plasma has been achieved with real time control of anode/cathode-heater. It has been confirmed that the temperature of cooled components were saturated and no evidence of damage were found. An innovative antenna having wide range of beam steering capability with linearly-moving-mirror concept has been designed for long pulse. Beam profile and mechanical strength analyses shows the feasibility of the antenna.

Journal Articles

Long pulse/high power ECRF system development in JT-60U

Moriyama, Shinichi; Kobayashi, Takayuki; Isayama, Akihiko; Terakado, Masayuki; Sawahata, Masayuki; Suzuki, Sadaaki; Yokokura, Kenji; Shimono, Mitsugu; Hasegawa, Koichi; Hiranai, Shinichi; et al.

Proceedings of 22nd IAEA Fusion Energy Conference (FEC 2008) (CD-ROM), 8 Pages, 2008/10

In the gyrotron development in JT-60U ECRF system, output power of 1.5 MW for 1 s has been achieved at 110 GHz. It is the world highest power oscillation $$>$$ 1 s. In addition to the carefully designed cavity and collector in view of thermal stress, an RF shield for the adjustment bellows, and a low-dielectric-loss DC break enabled this achievement. Power modulation technique by anode voltage control was improved to obtain high modulation frequency and 5 kHz has been achieved for NTM stabilizing experiments. Long pulse demonstration of 0.4 MW, 30 s injection to the plasma has been achieved with real time control of anode/cathode-heater. It has been confirmed that the temperature of cooled components were saturated and no evidence of damage were found. An innovative antenna having wide range of beam steering capability with linearly-moving-mirror concept has been designed for long pulse. Beam profile and mechanical strength analyses shows the feasibility of the antenna.

Journal Articles

Heating and current drive by electron cyclotron waves in JT-60U

Suzuki, Takahiro; Ide, Shunsuke; Hamamatsu, Kiyotaka; Isayama, Akihiko; Fujita, Takaaki; Petty, C. C.*; Ikeda, Yoshitaka; Kajiwara, Ken*; Naito, Osamu; Seki, Masami; et al.

Nuclear Fusion, 44(7), p.699 - 708, 2004/05

 Times Cited Count:31 Percentile:69.28(Physics, Fluids & Plasmas)

no abstracts in English

Oral presentation

Progress in 170 GHz / 1 MW gyrotoron development for ITER ECH / ECCD system

Ikeda, Ryosuke; Kajiwara, Ken; Oda, Yasuhisa; Takahashi, Koji; Aoki, Takashi; Oshima, Katsumi; Tsubota, Naoaki; Kobayashi, Takayuki; Moriyama, Shinichi; Sakamoto, Keishi

no journal, , 

no abstracts in English

Oral presentation

Observation of grouting material in fractured granite by non-destructive integrated CT-XRD method

Hitomi, Takashi*; Kajiwara, Kentaro*; Sugiyama, Takafumi*; Sato, Toshinori

no journal, , 

As a part of research and development of high-level radioactive waste disposal, the effect upon rocks of grouting materials, which are used lining of galleries and water stopping, are studied. Non-destructive integrated CT-XRD method was developed, that is consist of X-ray CT observation and X-ray diffraction of test pieces using X-ray source of large scale synchrotron radiation facility. This report described the effectiveness of this observation method that is applied to observation of constitution minerals of the rock and the grout about a crack part of the granite which was injected grout materials.

Oral presentation

Development of ITER gyrotron system for the actual equipments

Ikeda, Ryosuke; Oda, Yasuhisa; Kajiwara, Ken; Terakado, Masayuki; Aoki, Takashi; Oshima, Katsumi; Tsubota, Naoaki; Hayashibara, Masashi; Hayashi, Kazuo*; Kobayashi, Takayuki; et al.

no journal, , 

no abstracts in English

Oral presentation

Neutron scattering studies on trinuclear Zn-Ln-Zn single-molecule magnets

Kofu, Maiko; Kajiwara, Takashi*; Kawamura, Seiko; Kikuchi, Tatsuya*; Nakajima, Kenji; Matsuura, Masato*; Shibata, Kaoru; Nagao, Michihiro*; Yamamuro, Osamu*

no journal, , 

no abstracts in English

13 (Records 1-13 displayed on this page)
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